Headphone detection circuit and electronic device with headphone detection circuit

An electronic device comprising:

• a headphone port, configured to connect to a headphone;
• a processing unit, configured to outputs left channel signals and right channel signals by playing an audio file in response to an operation of a user;
• an audio amplifier, connected to the headphone port and the processing unit, configured to receive the left channel signals and right channel signals output from the processing unit and amplify the left channel signals and right channel signals to obtain amplified left channel signals and right channel signals;
• and
• a headphone detection circuit, comprising:
• a voltage output module, connected to the headphone port and the audio amplifier, configured to produce a first voltage when the headphone port does not connected to the headphone, and configured to produce a second voltage when the headphone port is connected to the headphone;
• and
• a trigger signal producing module, connected to the voltage output module and a processing unit, configured to output a loudspeaker trigger signal to the processing unit when receiving the first voltage;
• and output a headphone trigger signal to the processing unit when receiving the second voltage;
• wherein, the processing unit outputs left channel signals and right channel signals with a relative higher gain when receiving the loudspeaker trigger signal and outputs left channel signals and right channel signals with a relative lower gain when receiving the headphone trigger signal;
• the audio amplifier outputs the amplified left channel signals and right channel signals to a loudspeaker when receiving the first voltage and outputs the amplified left channel signals and right channel signals to the headphone port when receiving the second voltage.